Heuchera plant named ‘TNHEUNEL’

ABSTRACT

A new and distinct  Heuchera  plant characterized by yellow to lime colored leaves, medium large, slightly lobed, geranium like leaves, rust red flowers in narrow spikes in spring on upright flowering stems, good sun tolerance, a large, mounding habit with excellent crown count, and excellent vigor.

Botanical denomination: Heuchera hybrid.

Variety designation: ‘TNHEUNEL’.

BACKGROUND OF THE INVENTION

The present invention relates to a new and distinct cultivar of Heucheraand given the cultivar name of ‘TNHEUNEL’. Heuchera is in the familySaxifragaceae. Heuchera ‘TNHEUNEL’ originated as a controlled crossusing Heuchera ‘K803-2’, a proprietary, unpatented, unnamed plant as theseed parent, and Heuchera ‘K803-4’, a proprietary, unpatented, unnamedplant as the pollen parent. These parents are a result of breeding usinghardy Heuchera richardsonii with proprietary hybrid lines. Heuchera‘TNHEUNEL’ was bred to be a hardy, large, landscape plant.

Compared to the seed parent, Heuchera ‘K803-2’, the new cultivar has alarger habit and the flowers are rust red rather than green.

Compared to the pollen parent, Heuchera ‘K803-4’, the new cultivar has alarger habit.

Compared to Heuchera ‘Citronelle’, U.S. Plant Pat. No. 17,934, the newcultivar has smaller, rounder, thicker, leaves. The flowers of the newcultivar are rust red rather than white.

This new Heuchera is uniquely distinguished by:

-   -   1. yellow to lime colored leaves,    -   2. medium large, slightly lobed, geranium like leaves,    -   3. rust red flowers in narrow spikes in spring on upright        flowering stems,    -   4. good sun tolerance,    -   5. a large, mounding habit with excellent crown count, and    -   6. excellent vigor.

This new cultivar has been reproduced only by asexual propagation (tipcuttings and tissue culture using growing tips). Each of the progenyexhibits identical characteristics to the original plant. Asexualpropagation in 2013 by cuttings and tissue culture using standardmicropropagation techniques with terminal and lateral shoots, as done inCanby, Oreg., shows that the foregoing characteristics and distinctionscome true to form and are established and transmitted through succeedingpropagations. The present invention has not been evaluated under allpossible environmental conditions. The phenotype may change withvariations in environment without a change in the genotype of the plant.

BRIEF DESCRIPTION OF THE DRAWINGS

FIG. 1 shows a three year old plant of Heuchera ‘TNHEUNEL’ in flowergrowing in the trial bed in April in Canby, Oreg.

FIG. 2 shows the same plant in August.

DETAILED PLANT DESCRIPTION

The following is a detailed description of the new Heuchera cultivarbased on observations taken in April of one-year-old specimens growingin the trial field in Canby, Oreg. Canby is Zone 8 on the USDA Hardinessmap. Temperatures range from a high of 95 degrees F. in August to anaverage of 32 degrees F. in January. Normal rainfall in Canby is 42.8inches per year. The color descriptions are all based on The RoyalHorticultural Society Colour Chart, 5^(th) edition, 2007.

-   Plant:    -   -   Form.—Basal rosette, herbaceous perennial.        -   Hardiness.—USDA Zone 4 to 9.        -   Size.—27 cm tall from top of the foliage to the ground and            40 cm wide (mature plant grows to 35 cm tall and 58 cm            wide).        -   Number of crowns.—About 40.        -   Habit.—Medium large, mounding.        -   Vigor.—Excellent.-   Leaf:    -   -   Type.—Simple.        -   Arrangement.—Rosette.        -   Shape.—Broadly ovate to orbicular.        -   Number.—About 200.        -   Blade size.—Grows to 11.3 cm long and 11.3 cm wide.        -   Venation.—Palmate.        -   Lobing/division.—7 shallow palmate lobes.        -   Margins.—Crenate.        -   Apex.—Mucronulate.        -   Base.—Cordate, strongly overlapping and sometimes spiraling            in.        -   Surface texture.—Glandular-puberulent on both sides.        -   Leaf rugosity.—Absent.        -   Petiole description.—Grows to 15 cm long and 3.5 mm wide,            glandular hairs, color closest to Yellow Green 145B, tinted            Greyed Red 182C at base.        -   Leaf color.—Spring new leaves, top and bottom side including            veins Yellow Orange 16B; mature leaves Yellow Green 144A            with veins 145C, bottom side Yellow Green 146D with veins            145C.-   Inflorescence:    -   -   Size.—Grows to 4.5 cm wide and 11.5 cm long.        -   Type.—Upright thyrse.        -   Number of flowers per thyrse.—About 110.        -   Number of thyrse.—About 20.        -   Peduncle.—Grows to 38 cm long and 5 mm wide at base,            glandular hairs, Yellow Green 146B lightly tinted Greyed Red            178A on top ⅓.        -   Pedicel.—Grows to 3 mm long, with glandular hairs, Greyed            Orange 177B.        -   Bloom period.—Late April to June in Canby, Oreg.-   Flower bud:    -   -   Size.—3 mm wide and 5 mm long.        -   Description.—Glandular puberulent, ovoid, down facing.        -   Color.—Greyed Red 182A.-   Flower:    -   -   Type.—Perfect.        -   Shape.—Campanulate.        -   Attitude.—Side and down-facing.        -   Size.—6 mm long and 6 mm wide.        -   Corolla description.—5 petals, each 4 mm long and 1.3 mm            wide, spatulate, margins entire, tip acute,            glandular-puberulent and Greyed Purple 186B on both sides.        -   Calyx description.—Campanulate, 6 mm long and 6 mm wide,            with 5 lobes with wide sinuses divided ½ way to the base,            each 2 mm wide and 3 mm long, oblong in shape, back side            glandular-puberulent, glabrous inside, tip obtuse, margin            entire, Greyed Red 179B on both sides.        -   Stamen description.—5 in number, filaments 2.5 mm long,            White NN155A, anthers 1 mm long, Orange 26A, pollen Yellow            Orange 16A.        -   Pistil description.—1, 2-beaked, 5 mm long and 2 mm wide,            Greyed Red 179C overall, ovary 2 mm long and 2 mm wide,            style 2 mm long.        -   Fragrance.—None.        -   Lastingness.—Each thyrse blooms for about 3 weeks on the            plant.-   Fruit and seed: None seen.-   Pest and disease tolerance: The new cultivar is typical to the    genus. No known resistances to pests or diseases. No problems have    been found in Canby, Oreg.

I claim:
 1. A new and distinct Heuchera plant as herein illustrated anddescribed.